package com.heima.app.gateway.filter;


import com.heima.app.gateway.util.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
@Slf4j
public class AuthorizeFilter implements Ordered, GlobalFilter {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {

        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        //判断路径
        if (request.getPath().toString().contains("login")) {
            //登陆请求，直接放行
          return chain.filter(exchange);
        }
        //解析token
        String token = request.getHeaders().getFirst("token");
        if(StringUtils.isEmpty(token))
        {
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //判断token是否伪造
        try{
            Claims claims = AppJwtUtil.getClaimsBody(token);
            //判断token有没有过期
            int i = AppJwtUtil.verifyToken(claims);
            if(i==1||i==2)
            {
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }
                //将用户id存入请求头中
            Object userId = claims.get("id");
            request.mutate().headers(httpHeaders -> {
                httpHeaders.add("userId",userId.toString());
            });
            exchange.mutate().request(request).build();
            //走到这表明验证都通过了
            return chain.filter(exchange);
        }catch (Exception e)
        {
            e.printStackTrace();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

    }

    /**
     * 优先级设置  值越小  优先级越高
     * @return
     */
    @Override
    public int getOrder() {
        return 0;
    }
}
